diff --git a/library/havege.c b/library/havege.c
index 08f9d97..c139e1d 100644
--- a/library/havege.c
+++ b/library/havege.c
@@ -38,8 +38,19 @@
 #include "mbedtls/timing.h"
 #include "mbedtls/platform_util.h"
 
+#include <limits.h>
 #include <string.h>
 
+/* If int isn't capable of storing 2^32 distinct values, the code of this
+ * module may cause a processor trap or a miscalculation. If int is more
+ * than 32 bits, the code may not calculate the intended values. */
+#if INT_MIN + 1 != -0x7fffffff
+#error "The HAVEGE module requires int to be exactly 32 bits, with INT_MIN = -2^31."
+#endif
+#if UINT_MAX != 0xffffffff
+#error "The HAVEGE module requires unsigned to be exactly 32 bits."
+#endif
+
 /* ------------------------------------------------------------------------
  * On average, one iteration accesses two 8-word blocks in the havege WALK
  * table, and generates 16 words in the RES array.